Apparatus for developing film in daylight



Feb. 22, 1938. J. EGGERT ET AL APPARATUS FOR DEVELOPING FILM IN DAYLIGHTFiled Jan. 22, 1936 2 Sheets-Sheet l In ven fors By fire/r Afforneys#(g; at 3.152;

1938. J. EGGERT ET AL APPARATUS FOR DEVELOPING FILM IN DAYLIGHT FiledJan. 22, 1936 2 Sheets-Sheet 2 John E q gert i i9 Luft In ven fors By.their Aflomeys Patented Feb. 22, 1938 UNITED STATES PATENT OFFICEAPPARATUS FOR DEVELOPING FILM IN DAYLIGHT trie Aktiengeseilschaft,

Main, Germany Frankfort on the Application January 22, 1936, Serial No.60,186 In Germany January 24, 1935 Claims.

This invention relates to an apparatus for developing films in day-lightand more particularly to an apparatus for developing dental film inday-light.

5 One of its objects is an apparatus for developing dental film inday-light which is simple in construction and efficient in use. Furtherobjects will be seen from the detailed specification followinghereafter. Reference is made to the accompanying drawings in which:

Figs. 1 and 2 show a package of dental film intended for use with thedeveloping apparatus according to this invention,

Fig. 3 shows a side View of a developing apparatus in accordance withthis invention,

Fig. 4 shows a front view of the developing apparatus shown in Fig. 3,and

Fig. 5 shows a section through a developing apparatus in accordance withthe invention on 20 the line 55 of Fig. 4.

Fig. 6 shows a vessel for receiving the processing baths.

Fig. 7 shows a section on the line 'l'! of Fig. 5.

With the apparatus according to the present invention it is possible toremove dental films, that is to say, out films without a tab indaylight, from a light-tight package, and to introduce the cut filmseach separately in a developing vessel without the necessity ofperforming these operations in a dark room. Apparatus for developing cutfilms have already been described, but these apparatus are onlyapplicable to cut films provided with tabs or similar devices, whichmade necessary a particular drawing-off device.

The apparatus in accordance with this invention allows the dentist tohave at hand in a very short time a finished X-ray picture on two ormore simultaneously developed films which were together in a commonpackage, without the use of a dark room. The apparatus will be describedwith reference to the accompanying drawings. In the apparatus shown inFigs. 3 to 5 45 the dental film is inserted after exposure in packedcondition in day-light and after closing the apparatus, the films areintroduced into a light-tight room in which the films are developed byimmersing the apparatus in the different photographic treating liquids.In the developing apparatus a number of separate chambers is providedcorresponding with the number of films to be developed.

In Figs. 1 and 2 there is shown for example the manner in which twodental films are wrapped in a protective paper and made into a dentalfilm package.

Figs. 1 and 2 are shown of exaggerated breadth for the sake ofclearness. a1 and cm are the two films, b is the paper strip and c is ametal insertion against the closure. The external wrapper d has theclosing fiap (11 outside the protective strip 1) (in); this forms theouter layer on the closure side against the metal sheet 0. The dottedline d2 is a sealing sheet which is gummed to the packet and preventsautomatic opening. After removing this sheet (12 and bending back thefiap d1 of the external wrapper (Fig. 2), the end D1 of the protectivestrip is turned down and inserted through the openings 0 of theantechamber e (Fig. 5) of the developing apparatus where it is clampedin such a manner that as the strip 17 is withdrawn the films fallsuccessively into the developing chamber h.

The films freed from the light-tight package are introduced into thedeveloping chamber h (Figs. 3 to 5). An opening g made light-tight by alining with velvet serves for drawing off the protective paper strip 1)by pulling the end In. The apparatus operates in the following manner:

If the fold of the strip b which envelopes the film a2 is pulled off thedeveloping apparatus, the said film falls into the chamber hi which isopened for its reception by suitable adjustment of the flap i by meansof the lever 70. If now the developing chamber ha is opened by turningthe lever 7c correspondingly, the film a1 falls into this second chamber722 when further pulling the protective paper strip b Thus the two filmscan be developed each in a separate chamber.

Figs. 4, 5 and 7 show an example of the construction of a developingapparatus, e is the antechamber for receiving the film packing and isconnected with the lower part h of the apparatus by means of a slotfthrough which the films fall one after the other in the chambers hi andha into which the lower part h is divided by the wall q, when pullingthe protective paper strip b (Fig. 5). The film pack which in Figs. 1and 2 has been shown in a drawn out condition for the sake of clearnessis shown in dotted lines in Fig. 5; with its other part it protrudesthrough a slot u of the casing e and the casing e is protected from theentrance of light by means of washers of felt or velvet. The chambers hiand hz can be closed by means of flap i (Fig. 5) which can be actuatedby means of a lever is. These chambers are provided with ledges t or thelike which prevent adhesion of the films to the wall. As is shown inFigs. 5 and 7, the film a2 is slightly larger than the distance betweenthe ledges if, so that these latter prevent the film from touching thewall. The chamber h is prevented against the entrance of light by meansof a chamber Z which is made light-tight in the usual manner by means ofoppositely directed bailles m. The upper chamber 6 can be opened byturning the part w around the hinge n (Figs. 3 and 4).

When two films a1 and (12 have been brought into the two developingchambers in and 7L2 respectively, the whole device is immersed in thevessel containing the developing or fixing or washing liquid.Advantageously for providing for the different developing and washingliquids to be used in the vessels (Fig. 6) overflow pipes p of thelatter are placed at different heights in the several vessels so thatthe developing apparatus may be immersed to successively greater depthsin the several vessels 0.

What we claim is:

1. An apparatus for developing dental film in day light which comprisesa casing, a chamber in said casing for a dental film pack encased in aprotective paper strip, a further chamber below said first chamber andcommunicating therewith by a slot for allowing the transport of saidfilms from said first into said second chamber, said casing having aslot in a wall thereof leading from said first chamber for the receptionof said protective strip, means for excluding the entrance of lightthrough said latter slot, said second chamber having an opening thereinfor the admission of a treating fluid and means for preventing entranceof light through said opening.

2. An apparatus for developing dental film in daylight which comprises acasing, a chamber in said casing for a dental film pack encased in aprotective paper strip, a rear wall in said chamber, a front wall hingedto said rear wall allowing said chamber to be opened for inserting saidfilm pack, a further chamber below said first chamber and communicatingtherewith by a slot for allowing the transport of said films from saidfirst into said second chamber, said casing having a slot in a wallthereof leading from said first chamber for the reception of saidprotective strip, means for excluding the entrance of light through saidlatter slot, said second chamber having an opening therein for theadmission of a treating fiuid and means for preventing entrance of lightthrough said opening.

3. An apparatus for developing dental film in daylight which comprises acasing, a chamber in said casing for a dental film pack encased in aprotective paper strip, a rear wall in said chamher, a front wall hingedto said rear wall allowing said chamber to be opened for inserting saidfilm pack, a further chamber below said first chamber and communicatingtherewith by a slot for allowing the transport of said films from saidfirst into said second chamber, said casing having a slot in a wallthereof leading from said first chamber for the reception of saidprotective strip, means for excluding the entrance of light through saidlatter slot, said second chamber having an opening therein for theadmission of a treating fluid and means for preventing entrance of lightthrough said opening, a wall in said second chamber separating saidchamber into two chambers; a flap hinged to said wall and means outsidesaid casing for turning said fiap and. being connected with said casingin light tight manner.

4. An apparatus for developing dental film in daylight which comprises acasing, a chamber in said casing for a dental film pack encased in aprotective paper strip, a rear wall in said chamber, a front wall hingedto said rear wall allowing said chamber to be opened for inserting saidfilm pack, a further chamber below said first chamber and communicatingtherewith by a slot for allowing the transport of said films from saidfirst into said second chamber, said casing having a slot in a wallthereof leading from said first chamber for the reception of saidprotective strip, means for excluding the entrance of light through saidlatter slot, said second chamber having an opening therein for theadmission of a treating fluid, removably mounted means for preventingentrance of light through said opening, a wall in said second chamberseparating said second chamber into two chambers; a flap hinged to saidwall and means outside said casing for turning said flap and beingconnected with said casing in light tight manner.

5. An apparatus for developing dental film in daylight which comprises acasing, a chamber in said casing for a dental film pack encased in aprotective paper strip, a rear wall in said chamber, a front wall hingedto said rear wall allowing said chamber to be opened for inserting saidfilm pack, a further chamber below said first chamber and communicatingtherewith by a slot for allowing the transport of said films from saidfirst into said second chamber, said casing having a slot in a wallthereof leading from said first chamber for the reception of saidprotective strip, means for excluding the entrance of light through saidlatter slot, said second chamber having an opening therein for theadmission of a treating fluid, removably mounted means for preventingentrance of light through said opening, ledges in said second chamber ata distance from each other smaller than the width of the film, a wall insaid second chamber separating said chamber into two chambers; a flaphinged to said wall and means outside said casing for turning said flapand being connected with said casing in light tight manner.

JOHN EGGERT. FRITZ LUFT.

